<1uA measurement

Hideki Hayashi1

Other Parts Discussed in Thread: INA190

Hi team,

Customer wants to measure low-side current with <1uA. Can you suggest solution for it? can be with INAxxx family or discrete solution. But need small size solution.

Regards,

Hayashi

over 2 years ago

+1 Joseph Scherphorn over 2 years ago

TI__Expert 4020 points

Hello Hideki,

What voltages will be seen by device? The INA190 (CMR -0.2 V to 40 V, supply 1.7 V to 5.5 V) is the only current sense amp that will get you into that current range, outside of that you will need to be looking at instrumentation amplifiers.

0 Hideki Hayashi1 over 2 years ago in reply to Joseph Scherphorn

TI__Expert 8380 points

Hi Joseph,

As I calcurated error in 1uA by referring this app note, it would be around 1.1~1.2% with 5kohm depending on Gain selection. And if the lowest current will 0.1uA, the error will be 10% error. I will check with customer if they can accept or not.

Regards,

Hayashi

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<1uA measurement